化工学报 ›› 2021, Vol. 72 ›› Issue (5): 2596-2603.DOI: 10.11949/0438-1157.20201429
尹子骏1(),苏胜1(),卿梦霞2,赵志刚1,王中辉1,王乐乐3,江龙1,汪一1,胡松1,向军1
收稿日期:
2020-10-12
修回日期:
2020-11-26
出版日期:
2021-05-05
发布日期:
2021-05-05
通讯作者:
苏胜
作者简介:
尹子骏(1996—),男,硕士研究生,基金资助:
YIN Zijun1(),SU Sheng1(),QING Mengxia2,ZHAO Zhigang1,WANG Zhonghui1,WANG Lele3,JIANG Long1,WANG Yi1,HU Song1,XIANG Jun1
Received:
2020-10-12
Revised:
2020-11-26
Online:
2021-05-05
Published:
2021-05-05
Contact:
SU Sheng
摘要:
选择性催化还原(SCR)技术由于脱硝效率高、选择性好而被广泛应用于烟气氮氧化物排放控制;然而,目前广泛采用的钒钛系SCR脱硝催化剂会使烟气中SO2氧化成SO3,烟气中过高的SO3对电厂安全运行会造成严重影响,也会对环境造成污染。以典型V2O5-WO3/TiO2催化剂为研究对象,系统研究了SCR脱硝过程中烟气流量、温度、O2浓度、SO2浓度等对催化剂表面SO3生成特性的影响,并进一步对SO3生成的反应动力学特性进行了分析。研究表明:催化剂表面SO3生成反应中SO2的反应级数为0.59,当O2浓度大于3%时,O2的反应级数为0,该反应的表观活化能为70.39 kJ/mol;实验条件下,烟气中SO2浓度增加会使SO3生成的反应速率提高;O2浓度对催化剂表面SO3生成影响并不显著;烟气温度对催化剂表面SO3生成具有显著影响,高温会促进SO3的生成。
中图分类号:
尹子骏, 苏胜, 卿梦霞, 赵志刚, 王中辉, 王乐乐, 江龙, 汪一, 胡松, 向军. 一种典型钒钛系SCR催化剂SO3生成特性研究[J]. 化工学报, 2021, 72(5): 2596-2603.
YIN Zijun, SU Sheng, QING Mengxia, ZHAO Zhigang, WANG Zhonghui, WANG Lele, JIANG Long, WANG Yi, HU Song, XIANG Jun. Study on SO3 formation characteristics of a typical vanadium titanium SCR catalyst[J]. CIESC Journal, 2021, 72(5): 2596-2603.
Ti | W | V | S | Si | Al | Fe | Ca | 其他 |
---|---|---|---|---|---|---|---|---|
83.88% | 6.48% | 1.51% | 1.42% | 2.56% | 1.06% | 0.09% | 0.93% | 2.07% |
表1 催化剂化学成分的检测结果(质量分数)
Table 1 Test results of XRF of catalyst
Ti | W | V | S | Si | Al | Fe | Ca | 其他 |
---|---|---|---|---|---|---|---|---|
83.88% | 6.48% | 1.51% | 1.42% | 2.56% | 1.06% | 0.09% | 0.93% | 2.07% |
比表面积/(m2/g) | 孔容/(cm3/g) | 平均孔径/nm |
---|---|---|
65.38 | 0.32 | 19.17 |
表2 催化剂比表面积检测结果
Table 2 Test results of BET of catalyst
比表面积/(m2/g) | 孔容/(cm3/g) | 平均孔径/nm |
---|---|---|
65.38 | 0.32 | 19.17 |
温度/℃ | 流量/(L/min) | 气体成分 |
---|---|---|
360 | 0.5~1.5 | 600×10-6 SO2、3% O2、N2平衡 |
280~400 | 1 | 600×10-6 SO2、3% O2、N2平衡 |
360 | 1 | (400~1200)×10-6 SO2、3% O2、N2平衡 |
360 | 1 | 600×10-6 SO2、1.5%~10% O2、N2平衡 |
表3 SO3生成实验的实验工况参数
Table 3 Experimental condition parameters of SO3 generation experiment
温度/℃ | 流量/(L/min) | 气体成分 |
---|---|---|
360 | 0.5~1.5 | 600×10-6 SO2、3% O2、N2平衡 |
280~400 | 1 | 600×10-6 SO2、3% O2、N2平衡 |
360 | 1 | (400~1200)×10-6 SO2、3% O2、N2平衡 |
360 | 1 | 600×10-6 SO2、1.5%~10% O2、N2平衡 |
SO2体积 分数 | 系统入口SO2总量/mmol | 冷凝管中SO3生成量/mmol | 吸收液中SO2含量/mmol | SOx收集 率/% |
---|---|---|---|---|
400×10-6 | 1.07 | 0.0082 | 1.01 | 95.16 |
600×10-6 | 1.61 | 0.0085 | 1.52 | 94.94 |
800×10-6 | 2.14 | 0.0088 | 2.10 | 98.54 |
表4 不同SO2浓度下反应系统SOx收集率
Table 4 SOx collection rate of reaction system under different SO2 concentration
SO2体积 分数 | 系统入口SO2总量/mmol | 冷凝管中SO3生成量/mmol | 吸收液中SO2含量/mmol | SOx收集 率/% |
---|---|---|---|---|
400×10-6 | 1.07 | 0.0082 | 1.01 | 95.16 |
600×10-6 | 1.61 | 0.0085 | 1.52 | 94.94 |
800×10-6 | 2.14 | 0.0088 | 2.10 | 98.54 |
反应温度/℃ | 表观速率常数×107/ (L/(g?min)) |
---|---|
280 | 4.80 |
320 | 8.42 |
360 | 27.74 |
400 | 68.47 |
表5 表观速率常数与反应温度的关系
Table 5 Relationship between rate constant and reaction temperature
反应温度/℃ | 表观速率常数×107/ (L/(g?min)) |
---|---|
280 | 4.80 |
320 | 8.42 |
360 | 27.74 |
400 | 68.47 |
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